@book{ BA5437429X,
  author    = "López Jaena, Graciano and Alzona, Encarnación and Agoncillo, Teodoro A. and National Historical Commission (Philippines)",
  title     = "Speeches, articles and letters",
  publisher = "National Historical Commission",
  year      = "1974",
  URL       = "http://ci.nii.ac.jp/ncid/BA5437429X"
}